| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 43°F | 34°F | 1.3" |
| February | 29°F | 49°F | 38°F | 1.0" |
| March | 33°F | 58°F | 45°F | 1.6" |
| April | 36°F | 64°F | 50°F | 1.2" |
| May | 43°F | 74°F | 58°F | 1.4" |
| June | 49°F | 81°F | 65°F | 1.3" |
| July | 56°F | 92°F | 75°F | 0.2" |
| August | 55°F | 91°F | 73°F | 0.3" |
| September | 48°F | 80°F | 63°F | 0.5" |
| October | 39°F | 66°F | 51°F | 1.1" |
| November | 31°F | 52°F | 41°F | 1.4" |
| December | 25°F | 41°F | 32°F | 1.9" |
| Index | Mission | Oregon | National |
| Air quality index | 38 | 32 | 42 |
| Pollution index | 4,405,170 | 7,156,356 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 286 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 6 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Weston, OR | 586 | 23 | 54.0% |
| Helix, OR | 284 | 38 | 24.0% |
| Tutuilla, OR | 360 | 38 | 24.0% |
| Pilot Rock, OR | 1,293 | 38 | 24.0% |
| Kirkpatrick, OR | 223 | 38 | 24.0% |
| Mission, OR | 888 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Waverly Hall, GA | 888 | 42 | 16.0% |
| Aplington, IA | 888 | 39 | 22.0% |
| Walker, IA | 888 | 39 | 22.0% |
| Stephenson, MI | 888 | 36 | 28.0% |
| Schroon Lake, NY | 888 | 36 | 28.0% |
| Mission, OR | 888 | 38 | 24.0% |
Here are the best places to live in Oregon
These are the largest cities in Oregon
See the best places to live in Mission
These are the 10 cheapest cities in Oregon